Texas Class C Surface Water Practice Exam

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• Why is it essential to measure the pH in the water treatment process?
• If the discharge pressure gauge on a pump reads 15 psi, this is equivalent to how many feet of head?
• If two pressure gauges at the foot of two storage tanks are at the same elevation and the water levels are the same, what will the gauge on tank X, holding 1,000,000 gallons, read compared to tank Y, holding 500,000 gallons?
• If a rotameter is calibrated to measure a certain gas, what must be done to use it for a different gas?
• What can result from gas chlorinators being operated at high rates?
• What is the effect of insufficient suction head on pump operation?
• When securing a locked-out switch, who is authorized to remove the warning tag?
• What is the recommended capacity for ground storage according to the State Board of Insurance?
• One of the purposes of water storage tanks is to:
• What could an increase in chlorine demand indicate regarding water quality?
• What condition will decrease the capacity of a centrifugal pump?
• Which of the following is considered a significant hazard in water treatment facilities?
• What percentage of chlorine does calcium hypochlorite contain?
• What is a major cause of wear in pump and motor shaft couplings?
• How many grams are in one kilogram?
• The amount of dissolved oxygen in water is primarily dependent on what factor?
• What is the most significant source of surface water in Texas?
• What is the volume of a cylinder with a radius of 5 ft. and height of 8 ft.?
• What indicates a leak in a chlorine cylinder valve when ammonia vapor is present?
• In the context of chlorine detection, what does the presence of white smoke signify?
• How can the occurrence of mud balls in filter beds be minimized?
• What tool is used to open and close chlorine valves?
• Which type of meter has no moving parts?
• What does the pH test of water indicate?
• Which type of pipe is most likely to be damaged by corrosion?
• Which of the following is NOT a function of a foot valve?
• What process is utilized to remove suspended particles and clarify water in treatment plants?
• The process of coagulation involves which of the following reactions?
• What is the volume of a 100 ft. diameter tank that is 12 ft. deep?
• What hazardous property is associated with chlorine gas?
• What chemical compound is primarily used for softening water?
• What is the primary responsibility of a certified waterworks operator?
• What is a potential disadvantage of operating gas chlorinators at excessive rates?
• The pH scale runs from ___ to ___?
• What is considered the most effective method for cross connection control?
• The TCEQ requires that results be recorded and submitted daily for surface water supplies for:
• Coagulation is influenced by which of the following factors?
• What is the typical volume of water that corresponds to one Million Gallons per Day (MGD)?
• Which of the following statements is true regarding the sedimentation process?
• How many gallons are there in one cubic foot of water?
• What can happen if chlorine gas is released in damp surroundings?
• What do organics in surface water combine with to form trihalomethanes?
• If a fire hydrant requires a nozzle pressure of 100 psi, what head of water is needed to supply it?
• If the chlorine residual is measured at 0.6 mg/L and 6.6 mg/L has been applied, what is the chlorine demand?
• What is the approximate volume in gallons of 15,000 cubic feet of water?
• In treating raw water, what process comes first before filtration?
• The performance of a pump is influenced when dealing with what component?
• What happens to chlorine demand when organic material is left inside a replaced water main?
• According to regulations, the minimum pressure in all water distribution systems should not be less than?
• Tracking and maintaining an operator's training records is ultimately the responsibility of the:
• What should a water system do to ensure safety after repairs or installations?
• Which chemical is commonly used to raise pH levels in water?
• A pH reading of 6.0 in raw water indicates that the sample is what?
• After installation or repair of a water line, what concentration of chlorine treatment is recommended?
• What should a water quality operator do to maintain compliance with daily reporting requirements?
• If the flow is 35,000 gallons per day, what is that in million gallons per day (MGD)?
• What is the main advantage of a venturimeter?
• What does a high chlorine demand in a well typically suggest?
• What component of a centrifugal pump is installed to hold the priming?
• What information must be included on a warning tag attached to a locked-out switch?
• How should valves be operated in high pressure lines?
• What does the volume of a water sample depend on?
• The Safe Water Drinking Act has set water quality standards for which of the following categories?
• A significant increase in chlorine demand from 0.9 mg/L to 3.0 mg/L during well chlorination indicates what?
• What is the difference between the amount of chlorine added to water and the residual chlorine at the end of the contact time?
• Chloramines are formed by the addition of chlorine and which other chemical?
• What is the primary purpose of fluoridation in municipal water supplies?
• What features should hand trucks have when loading or unloading 150 lb chlorine cylinders?
• Waterworks operator's holding grade C certificates are required to renew their certificates every three years and to:
• If the pressure gauge at the bottom of a 200 ft. standpipe reads 68 psi, what is the static head in feet?
• Which factors influence the loss-of-head through a sand filter bed?
• Given a chlorine demand of 3 mg/L, what would be the residual chlorine if 20 lbs of chlorine gas is used to treat 400,000 gallons of water?
• The DPD test method for chlorine residual typically involves the use of what?
• Before changing a gas chlorine cylinder in a room, the first step should be:
• What is considered the most important factor affecting the useful life of piping?
• Baffles in water treatment are used to prevent what issue in sedimentation basins?
• How is the diameter of a standpipe typically related to its height?
• How many gallons per minute are equivalent to a flow of 1.0 MGD?
• If a piezometer is inserted into a pressurized pipe at 50 psi, to what height will the water rise in the tube?
• What is the chemical symbol for sodium?
• What is the weight of one cubic foot of water?
• Pressure in water systems is commonly measured in which unit?
• A water treatment plant averages a flow of 261 gallons per minute. What is the daily flow in million gallons per day (MGD)?
• What is the pressure gauge reading at the base of a tank filled to a depth of 1 ft.?
• What is a common effect of using incorrect chemical dosage in water treatment processes?
• What type of screening is generally recommended for vent openings to minimize risks?
• How much 65% calcium hypochlorite is required to disinfect a water storage tank with a dosage of 50 mg/L, with the tank being 36 feet in diameter and 20 feet high?
• What is the maximum flow rate through a sand filter recommended to ensure effective filtration?
• A non-permit confined space by OSHA standards means a confined space that:
• What is a major consequence of failing to properly monitor disinfectant levels in water treatment?
• In raw water reservoirs, what is the most common benefit of aeration?
• What is the main purpose of a rotameter?
• A flow of 1.55 ft³ per second is equivalent to how many gallons per minute (gpm)?
• When a single water sample is reported as safe, what does this imply?
• What is considered the most significant water quality change in filter effluent?
• What does free chlorine residual in water represent?
• If sludge remains too long at the bottom of a sedimentation basin, what issue could arise?
• Sodium hypochlorite is primarily used for which purpose?
• In the context of confined spaces, what is a key determining factor for requiring a permit?
• How does the density of chlorine gas compare to that of air?
• The occurrence of which issue can be reduced by proper sedimentation in filter beds?
• When used in connection with the Safe Drinking Water Act, the term "MCL" means:
• What is a valve that connects a customer's service to the water main called?
• What role does the concentration of dissolved gas play in filtration?
• What is the purpose of testing alkalinity in water systems?
• What is formed when a coagulant reacts with finely divided and suspended material in raw water?
• Evaporation and transpiration represent which aspect of the water cycle in Texas?
• A pneumatic ejector is used primarily to lift water from low points. What device accomplishes this?
• Filter underdrains are important for which purpose in filtration systems?
• What is the final step in the removal of suspended matter in water after coagulation and sedimentation?
• What is the nature of ozone (O3) to humans?
• What is the relationship between water temperature and chlorine residuals when using the CACR method?
• What is the primary purpose of the Maximum Contaminant Level (MCL) in drinking water regulations?
• Which method is typically used for testing residual chlorine levels in water?
• What term describes mud, silt, clay, and other suspended matter in water that cause it to appear murky?
• What is the chemical name for muriatic acid?
• What purpose do polyphosphates serve in water treatment?
• Water that requires a large amount of soap to produce an acceptable lather is classified as what?
• What is required for a pump when the gland follower is pulled all the way down?
• What should vent openings on reservoirs and clearwells be?
• According to the average annual water budget for Texas, how does the majority of surface water leave the state?
• A pH value of 7.0 is considered to be what?
• What is the primary use of chlorine in water treatment?
• How much pressure in the mains will a 100,000-gallon reservoir develop compared to a 1-million gallon reservoir at the same elevation?
• What is the weight of water in terms of lbs per gallon?
• Examples of non-community water systems include:
• Why should prepared water sample bottles not be rinsed before collecting samples for bacteriological examination?
• According to the TCEQ, how many service connections must a public water system serve to be classified as such?
• Velocity of flow in water mains is typically expressed in what unit of measurement?
• What factor is considered the most important in preventing accidents in waterworks operations?
• Which reagent is used to determine chlorine residual in water?
• What solution is used to detect chlorine leaks?
• Which of the following conditions improves sedimentation efficiency?
• What are the three tests performed in the multiple-tube fermentation test?
• What is static head defined as?
• How many feet of water will one pound of pressure raise water?
• What is the primary use of sodium hypochlorite in water treatment facilities?
• What is the volume of a settling tank measuring 100 ft. long, 25 ft. wide, and 8 ft. deep?
• What is the result of increased hydrogen ion activity in water?
• How much leakage is acceptable from a packing gland?
• What can black stains on plumbing fixtures indicate?
• A hypochlorinator is used to feed what into a water supply?
• What term is commonly used to refer to disease-producing organisms?
• What is the effective pH range suitable for iron and manganese removal?
• When using the combined available chlorine residual (CACR) method, how should the CACR be adjusted when water temperature decreases?
• What is the minimum normal operating pressure stated for water distribution systems?
• A disease that cannot be contracted by drinking contaminated water is:
• Which of the following is NOT a purpose of filter underdrains or bottoms?
• What is the chemical symbol for iron?
• What is the required chlorine residual that distribution systems must maintain in the far reaches according to public water regulations?
• When connecting a new chlorine cylinder, which item must be placed?
• Filters used in a water treatment process primarily serve to reduce what?
• Which of the following is a key characteristic of calcium hypochlorite?
• Why is it essential to monitor dissolved oxygen levels in water?
• In what type of environment is chlorine gas known to be corrosive?
• What happens to chlorine leaks in metal containers over time?
• What is the primary function of a piezometer in a water system?
• Which organisms are commonly used as indicators of drinking water contamination?
• What effect does carbon dioxide in water have on pH levels?
• What type of pump may be damaged if started with the discharge valve closed?
• What is the primary function of an altitude valve?
• The Rules and Regulations for Public Water Systems require sedimentation basins to provide a minimum detention time of how many hours?
• What is a common result of inadequate pH stabilization in water treatment?
• When collecting a water distribution sample for bacteriological testing, how long should water be allowed to run before filling the sample bottle?
• What is the surface area of a clarifier with a diameter of 40 ft?
• What is one substance that a sand filter will not effectively remove?
• What is the general effect of corrosion in water treatment systems?
• How should the packing around the shaft of a centrifugal pump be adjusted?
• Soda ash is primarily used in water treatment processes to achieve which of the following?
• What is the equivalent temperature of water in Fahrenheit if the temperature in Celsius is 10 degrees?
• Which pH measurement indicates that water is basic?
• A grab sample represents the quality of water when?
• What does alkalinity measure in water?
• In terms of safety, what is crucial to ensure when transporting chlorine cylinders?
• Why are mechanical seals being increasingly installed in pumps?
• In water treatment, what is the importance of screening vent openings?
• The term floc refers to what in the context of water treatment?
• What does "gpm" stand for in water flow measurement?
• If the chlorinator setting is 35 lbs/day and the flow is 1.15 MGD, what is the chlorine dosage?
• Which agency defines public water systems in Texas?
• Calcium hypochlorite is typically available in what form?
• An employee without a breathing apparatus is in a room where chlorine gas suddenly begins leaking. What should the employee do first?
• Jar tests in water treatment are primarily used to determine what?
• In terms of water quality, what is a possible consequence of high levels of trihalomethanes in drinking water?
• Which treatment method is commonly used to remove tastes and odors caused by decaying vegetation?
• What is the approximate weight, in pounds, of 50,000 gallons of water?